Notices
1999 - 2016 Super Duty 1999 to 2016 Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
Sponsored by:
Sponsored by: Real Truck

2015 F350 MC Thread Plug

Thread Tools
 
Search this Thread
 
Old Mar 4, 2026 | 02:53 PM
  #1  
jbizub5192's Avatar
jbizub5192
Thread Starter
|
5th Wheeling
10 Year Member
Joined: May 2011
Posts: 42
Likes: 0
2015 F350 MC Thread Plug

Hi Everyone,

Do you know what thread size the 2 ports are on the master cylinder? I suspect a failing MC and want to plug the ports somehow to see if it is indeed a failing unit.
 
Reply
Old Mar 4, 2026 | 07:38 PM
  #2  
ifrythings's Avatar
ifrythings
Fleet Mechanic
10 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: Aug 2011
Posts: 1,570
Likes: 258
Not sure if this helps


 
Reply
Old Mar 4, 2026 | 07:55 PM
  #3  
jbizub5192's Avatar
jbizub5192
Thread Starter
|
5th Wheeling
10 Year Member
Joined: May 2011
Posts: 42
Likes: 0
Yes that very much helps! Mine is vacuum boost so its the m14x1.5 & m12x1.5. Whats the best way to go about plugging these ports? As its flare I cant run a normal bolt through it. I thought about getting 2 brake fitting with a line and crimp the lines. Doubt I will get it completely sealed though
 
Reply
Old Mar 4, 2026 | 08:13 PM
  #4  
Pikachu's Avatar
Pikachu
Lead Driver
20 Year Member
Photogenic
Photoriffic
Community Builder
Joined: Jun 2004
Posts: 6,315
Likes: 582
From: Amarillo, TEXAS!
Check with a parts store for flare plugs.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Clutchbuster
1997 - 2003 F150
6
Dec 4, 2023 08:06 AM
xxf150WL
Garage & Workshop
0
May 27, 2022 06:32 PM
1OldFordMan
Ford Inline Six, 200, 250, 4.9L / 300
2
Mar 2, 2010 08:57 PM
QFD90
1999 - 2003 7.3L Power Stroke Diesel
3
Apr 8, 2005 05:59 PM
Cruiseomatic
Ford Inline Six, 200, 250, 4.9L / 300
11
Dec 22, 2004 08:32 AM




All times are GMT -5. The time now is 06:58 PM.

story-0
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-1
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-2
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-3
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-4
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE
story-5
2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Slideshow: first look at the 810 hp 2026 Shelby F-150 Off-Road!

By Brett Foote | 2026-05-12 12:50:07


VIEW MORE
story-6
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Slideshow: Everything You Need to Know about the 2027 Super Duty Carhartt Package!

By Michael S. Palmer | 2026-05-07 17:51:06


VIEW MORE
story-7
10 Most Surprising 2026 Ford Truck Features!

Slideshow: 10 most surprising Ford truck options/features in 2026.

By Joe Kucinski | 2026-05-05 11:17:22


VIEW MORE
story-8
Top 10 Ford Trucks Coming to Mecum Indy 2026

Slideshow: Here are the top 10 Fords coming to Mecum Indy 2026.

By Brett Foote | 2026-05-04 13:49:49


VIEW MORE
story-9
5 Best / 5 Worst Ford Truck Wheels of All Time

Slideshow: The 5 best and 5 worst Ford truck wheels of all time

By Joe Kucinski | 2026-04-29 16:49:01


VIEW MORE